Implementation of JavaScript math.round() in Lua. Also, adds the function to Lua's math library

math_round.lua

-- math.round( num ) rounds num to the nearest integer following the 
-- same rules as the JavaScript version, i.e. if the fractional 
-- portion of number is .5 or greater, the argument is rounded to the 
-- next higher integer. If the fractional portion of number is less 
-- than .5, the argument is rounded to the next lower integer.
math.round = function(num) 
	return math.floor(num+.5)
end

-- Example Usage:
local function testRound( num )
	print( num, math.round( num ) )
end

testRound( 0.1 )	-- Output: 0.1	0
testRound( 0.5 )	-- Output: 0.5	1
testRound( 8.9 )	-- Output: 8.9	9 
testRound( -0.1 )	-- Output: -0.1	0
testRound( -0.5 )	-- Output: -0.5	0
testRound( -8.9 )	-- Output: -8.9	-9